河南叶县下寒武统辛集组单板类和腹足类化石的研究

本文描述和讨论了河南叶县杨寺庄下寒武统辛集组单板类１３种,腹足类２种,未定类１种。其中包括２新属６新种：Ｒｅｐｅｎｏｃｏｎｕｓ ｘｉｎｊｉｅｎｓｉｓ ｇｅｎ．ｎｏｖ．,Ｓｃｅｎｅｌｌａ ｐｙｃｎａ ｓｐ．ｎｏｖ．,Ｓｅｃｕｒｉｃｏｎｕｓ ｖｕｌｇａｒｉｓ ｓｐ．ｎｏｖ．,Ｏｂｔｕｓｏｃｎｕｓ ｇｒｏｓｓｉｃｏｓｔｕｓ ｓｐ．ｎｏｖ．,Ｉｇｏｒｅｌｌｉｎａ ｐｒｏｂｏｓｃｉｓ ｓｐ．ｎｏｖ．,Ｇａｌ     

卡拉胶固定粘质赛氏菌产碱性蛋白酶的研究

将粘质赛氏菌(Seratia marcescens)包埋于卡拉胶中,发现2．5％的卡拉胶适于固定该菌产碱性蛋白酶。固定化细胞在其较适宜产酶培养基中发酵,酶活力一般可达400u/ml,在卡拉胶中添加3％玉米粉和1%豆饼粉或2％砂子制备固定化细胞,其产酶能力分别提高了25%和23．9％;固定化细胞颗粒越小,其产酶能力越高。采用摇瓶半连续发酵。其产酶半衰期为14次(24小时为一个周期);而用环流器进行半连续发酵,其产酶半衰期为52次(12小时为一个周期),产酶效率分别比游离细胞摇瓶发酵的产酶效率高11．8％和45．07％,而环流器半连续发酵的产酶效率比摇瓶半连续发酵高29．7％。     

银杏授粉研究初报

本文报道银杏授粉的适宜品种,气候条件、不同时期、方法、浓度、雌花不同发育阶段等试验结果．为提高银杏的座果率提供有效的技术措施。     

ON A NEW PTEROSAUR (ZHEJIANGOPTERUS LINHAIENSIS GEN. ET SP. NOV.) FROM UPPER CRETACEOUS IN LINHAI, ZHEJIANG, CHINA

Largepterosaurwithamaximumwingspanofmorethan5metres.Theskullislowerandlonger,withoutmiddlecrestorsupraoccipita1crest.ThenasaIandpre-orbita1fenestraareconfluentcompletely,andoccupyaboutha1foftheskulI1ength.Thetoothlessbeakisslenderandpointed.The1ongneckiscomposedbyse-venslendercervicalvertebrae.Thenotariumconsistsofsixco-ossifiedanteriordorsalvertebrae-ThetaiIisextremlyshort.lthassixpairsof"A"shapegastralia.Theanteriorlimbsarestrong;thehumerusarethickandshort;thewing-metacarpalbonearelongert…     

高效液相色谱法测定猫豆中左旋多巴的含量

本文用高效液相色谱法测定了猫豆中主旋多巴［Ｌｅｖｏｄｏｐａ］的含量。考察了加样回收率为９８．７０％,变异系数为１．９９％。     

广东封开县罗沙岩洞穴遗址第一期发掘简报

封开罗沙岩第一期发掘,出土了一些打制石器,它们有明确的地层,并有绝对年代测定数据,有助于解决广东是否有旧石器文化的争论。     

Detection of gaps in sinusoids by frog auditory nerve fibers: importance in AM coding

Physiological studies were carried out in the frog (Rana pipiens pipiens) eighth nerve to determine: (i) whether the modulation rate or the silent gap was the salient feature that set the upper limit of time-locking to pulsed amplitude-modulated (PAM) stimuli, (ii) the gap detection capacity of individual eighth nerve fibers. Time-locked responses of 79 eighth nerve fibers to PAM stimuli (at the fiber's characteristic frequency) showed that the synchronization coefficient was a low-pass function of the modulation rate. In response to PAM stimuli having different pulse durations, a fiber gave rise to non-overlapping modulation transfer functions. The upper cut-off frequency of time locking was higher when tonepulses in PAM stimuli had shorter duration. The fact that the cut-off frequency was different for the different PAM series suggested that the AM rate was neither the sole, nor the main, determinant for the decay in time-locking at high AM rates. Gap detection capacity was determined for 69 eighth nerve fibers by assessing fiber's spiking activities to paired tone-pulses during an OFF-window and an ON-window. It was found that the minimum detectable gap of eighth nerve fibers ranged from 0.5 to 10 ms with an average of 1.23–2.16 ms depending on the duration of paired tone pulses. For each fiber, the minimum detectable gap was longer when the duration of tone pulses comprising the twin-pulse stimuli was more than four times longer. When the synchronization coefficient was plotted against the silent gap between tones pulses in the PAM stimuli, the gap response functions of a fiber as derived from multiple PAM series were equivalent to gap response functions deriving from twin-pulse series suggesting that it was the silent gap which primarily determined the upper limit of time-locking to PAM stimuli.Abbreviations MTF modulation transfer function - PAM pulse amplitude modulated - SAM sinusoidally amplitude modulated - SC synchronization coefficient - TW time window     

斑须蝽三代卵块的空间分布和田间抽样技术研究

通过田间调查和计算,明确了斑须蝽三代卵块呈聚集分布,且以负二项分布为主。理论抽样数当t＝1．00,D＝0．3时,n＝13．091/＋63．878,如果防治指标定为百株虫卵块12块时,则最大抽样数为173株,序贯抽样的累积虫卵块数量界限为：T0（N）＝0.12N±0．4735。田间随机取样以平行线和Z字形为最佳。     

水稻品种对白背飞虱种群增长的影响

白背飞虱在不同类型水稻品种上的分布、趋性、发育和繁殖力是不同的。它喜欢在杂交稻（汕优6号）上生活和繁殖,取食后成虫寿命最长,取食量、产卵趋性、产卵量、田间虫量均最大,种群增长快;在粳稻上却相反;常规灿稻和糯稻介于二者之间。在同一类型品种中,抗虫品种比感虫品种在上述特性方面差异明显。说明抗虫育种和种植抗虫品种是对该害虫综合治理的一项关键技术。     

不同生境下蓝桉的木材解剖研究

用光镜及扫描电镜对不同生境下的蓝桉（Ｅｕｃａｌｙｐｔｕｓｇｌｏｂｕｌｕｓ Ｌａｂｉｌｌ．）木材结构进行了解剖学观察,描述了木材结构特征。以蓝桉木材的１１ 个主要特征——导管频率、单孔率、导管直径、导管分子长度、管胞长度和直径、纤维管胞长度和直径、纤维长度、射线频率和高度为指标,对生长在不同生境下的蓝桉进行比较发现：随着纬度的增加,生长轮变化不明显;木材中大部分组成分子的数量特征,除导管频率有降低趋势外均与纬度成正相关。评述了年降雨量对蓝桉木材结构的影响